Which amino acid is a precursor to serotonin, a neurotransmitter that regulates your appetite, sleep, and mood?

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**Solution:**

1. **Tryptophan** is an essential amino acid that the human body cannot synthesize and must be obtained from dietary sources.

2. It serves as a biochemical precursor to serotonin, a neurotransmitter involved in regulating mood, appetite, and sleep.

3. The conversion process involves hydroxylation and decarboxylation of tryptophan to produce serotonin in the brain.

4. Other amino acids like isoleucine, valine, and methionine do not serve as precursors to serotonin.

**Answer:** Tryptophan

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